EP0250469A1 - Process and method for contact-free measurement of the pressure of vehicle tyres - Google Patents

Process and method for contact-free measurement of the pressure of vehicle tyres

Info

Publication number
EP0250469A1
EP0250469A1 EP19860906756 EP86906756A EP0250469A1 EP 0250469 A1 EP0250469 A1 EP 0250469A1 EP 19860906756 EP19860906756 EP 19860906756 EP 86906756 A EP86906756 A EP 86906756A EP 0250469 A1 EP0250469 A1 EP 0250469A1
Authority
EP
European Patent Office
Prior art keywords
pressure
vehicle
coupling
coils
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19860906756
Other languages
German (de)
French (fr)
Inventor
Wilfried Schoeps
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0250469A1 publication Critical patent/EP0250469A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
    • B60C23/0427—Near field transmission with inductive or capacitive coupling means
    • B60C23/0428—Near field transmission with inductive or capacitive coupling means using passive wheel mounted resonance circuits

Definitions

  • the invention relates to a method for the contactless measurement of the pressure of vehicle tires.
  • the measurement is carried out with a sensor on the wheel.
  • the sensor essentially consists of an electrical resonant circuit whose operating frequency is proportional to the pressure in the tire.
  • the working frequency is set by means of a pressure-sensitive membrane.
  • the pressure information is transmitted from the sensor to the vehicle without contact over a certain distance by means of an electromagnetic coupling to a coupling coil attached to the vehicle.
  • the vehicle contains suitable electronic devices for evaluating, displaying, alarming and regulating the air pressure.
  • the innovation consists in the fact that so far no methods are known which allow a non-contact, continuous measurement of the tire pressure, both during standstill and while driving, with the exception of the use of high-frequency transmitters built into the vehicle wheel.
  • the use of HF transmitters has the decisive disadvantage that several vehicles can interfere with one another, or that the system can interfere with other radio services or can be disturbed by them.
  • the invention has set itself the goal of being able to easily and inexpensively check the functional state of vehicle tires before or during the journey. So you can, for example Before landing an aircraft, check whether all wheels have the prescribed air pressure.
  • sensor A is attached to the wheel or an integrated part of the same. It is located at a certain distance in front of the coupling coil 3, which is firmly on
  • Vehicle is attached. This arrangement ensures a permanent transmission of information, regardless of the position or the operating mode (standstill / drive) of the wheel.
  • Fig. 2 is the electrical arrangement according to claim A and
  • Sensor A consists of an oscillating circuit
  • Coil 4a is in the upper mentioned distance from
  • Coupling coil 3 which is symbolized as the electromagnetic coupling k.
  • the sensor A is connected via the coupling k
  • Coupling coil 3 excited to a damped vibration.
  • Coupling coil The damped oscillation of the excited sensor is transferred to the amplifier 5 via the switch 2.
  • the frequency of the vibration is measured with the frequency meter 6 and displayed with a suitable display device 7.
  • the display is proportional to the tire pressure.
  • a frequency variable Vibration generator 1b generates a frequency that is close to the expected operating frequency of sensor A.
  • the frequency and the amplitude of the vibration generator 1b are amplified in the amplifier 5 and evaluated in the frequency meter 6. From the frequency meter
  • the vibration generator 1b is automatically readjusted until the frequency of the vibration generator 6 then corresponds to that of the sensor A.
  • Display 7 is displayed. The display is proportional to the tire pressure.
  • the vehicle wheel also contains an active one
  • Vibration generator 8 with a suitable auxiliary energy source 9 Vibration generator 8 with a suitable auxiliary energy source 9.
  • the information is transmitted via the coupling k to the coupling coil 3, amplified by the amplifier 5, with the frequency meter
  • Fig. 5 corresponds functionally to Fig. A with the addition that the
  • Auxiliary energy source 9 is replaced by a further coupling device 10, 11 with the coupling k2 and is fed from the vehicle.
  • the couplings kl and k2 can be used with a suitable one
  • the information about the tire pressure can be used not only for display purposes, but also for alarms when the pressure is too low or too high and for

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

Le procédé permet de mesurer continuellement et à distance la pression des pneumatiques de véhicules, indépendamment du fait que le véhicule, ou ses roues, soient immobiles ou en mouvement. Il est applicable à toutes sortes de pneumatiques et à tous les types de véhicules routiers, sur rails ou les avions. A l'aide du procédé décrit, on peut obtenir à chaque instant des informations sur la pression correcte ou anormale des pneumatiques d'une manière simple et économique. Ceci constitue un point important de la sécurité avant la mise en service ou durant la marche du véhicule.The method makes it possible to continuously measure the pressure of vehicle tires at a distance, regardless of whether the vehicle or its wheels are stationary or in motion. It is applicable to all kinds of tires and to all types of road vehicles, on rails or airplanes. Using the process described, information on the correct or abnormal tire pressure can be obtained at any time in a simple and economical manner. This is an important point of safety before putting into service or while the vehicle is running.

Description

VERFAHREN UND MESSMETHODE ZUR BERUEHRUNGSLOSEN MESSUNG DES DRUCKS VON FAHRZEUGREIFENMETHOD AND MEASURING METHOD FOR THE CONTACTLESS MEASUREMENT OF THE PRESSURE OF VEHICLE TIRES
BESCHREIBUNGDESCRIPTION
Die Erfindung bezieht sich auf ein Verfahren zur beruehrungslosen Messung des Drucks von Fahrzeugreifen. Die Messung wird mit einem Sensor am Rad vorgenommen. Der Sensor besteht im Wesentlichen aus einem elektrischen Schwingkreis dessen Arbeitsfrequenz proportional zum Druck im Reifen ist. Die Einstellung der Arbeitsfrequenz erfolgt mittels Betastigung ueber eine druckempfindliche Membran.The invention relates to a method for the contactless measurement of the pressure of vehicle tires. The measurement is carried out with a sensor on the wheel. The sensor essentially consists of an electrical resonant circuit whose operating frequency is proportional to the pressure in the tire. The working frequency is set by means of a pressure-sensitive membrane.
Die Uebertragung der Druckinformatiαn vom Sensor zum Fahrzeug erfolgt beruehrungslos ueber eine gewisse Distanz mittels einer elektromagnetischen Kopplung zu einer am Fahrzeug angebrachten KoppelspuLe. Das Fahrzeug enthaelt geeignete elektroniscne Vorrichtungen zur Auswertung, Anzeige, Alarmgabe und zur Regelung des Luftdrucks.The pressure information is transmitted from the sensor to the vehicle without contact over a certain distance by means of an electromagnetic coupling to a coupling coil attached to the vehicle. The vehicle contains suitable electronic devices for evaluating, displaying, alarming and regulating the air pressure.
Die Neuerung besteht darin, dass bisher keine Verfahren bekannt sind, die eine beruehrungslose, kontinuierliche Messung des Reifendrucks, waehrend des Stillstandes wie auch waehrend der Fahrt, erlauben, mit der Ausnahme der Verwendung von Hochfrequenzsendern, eingebaut im Fahrzeugrad. Die Verwendung von HF-Sendern hat aber den entscheidenden Nachteil, dass sich mehrere Fahrzeuge untereinander stoeren koennen, oder dass das System andere Funkdienste stoeren oder von diesen gestoert werden kann.The innovation consists in the fact that so far no methods are known which allow a non-contact, continuous measurement of the tire pressure, both during standstill and while driving, with the exception of the use of high-frequency transmitters built into the vehicle wheel. However, the use of HF transmitters has the decisive disadvantage that several vehicles can interfere with one another, or that the system can interfere with other radio services or can be disturbed by them.
Die Erfindung hat sich zum Ziel gesetzt, auf einfache und preiswerte Ueise den Funktionszustand von Fahrzeugreifen vor oder waehrend der Fahrt ueberpruefen zu koennen. Man kann somit z.B. vor der Landung eines Flugzeuges ueberpruefen, ob alle Raeder den vorgeschriebene Luftdruck aufweisen.The invention has set itself the goal of being able to easily and inexpensively check the functional state of vehicle tires before or during the journey. So you can, for example Before landing an aircraft, check whether all wheels have the prescribed air pressure.
Anhand von Schemazeichnungen Fig. 1 bis 5 wird die Erfindung beispielgebend erlaeutert: üie in Fig. 1 schematisch dargestellt ist der Sensor A am Rad befestigt oder ein integrierter Teil desselben. Er befindet sich in einem gewissen Abstand vor der Koppelspule 3, die fest am1 to 5, the invention is explained by way of example: As shown schematically in FIG. 1, sensor A is attached to the wheel or an integrated part of the same. It is located at a certain distance in front of the coupling coil 3, which is firmly on
Fahrzeug angebracht ist. Diese Anordnung gewaehrleistet eine dauernde Informationsuebertragung, unabhaengig von der Stellung oder der Betriebsart (Stillstand/Fahrt) des Rades.Vehicle is attached. This arrangement ensures a permanent transmission of information, regardless of the position or the operating mode (standstill / drive) of the wheel.
In Fig. 2 ist die elektrische Anordnung nach Patentanspruch A undIn Fig. 2 is the electrical arrangement according to claim A and
5 dargestellt. Der Sensor A besteht aus einem Schwingkreis5 shown. Sensor A consists of an oscillating circuit
(Kondensator 4b, Spule 4a), dessen beide Teile oder eines davon vom Reifendruck verstellt werden und somit die Arbeitsfrequenz(Capacitor 4b, coil 4a), the two parts or one of which are adjusted by the tire pressure and thus the working frequency
(Resonanzfrequenz) ein Mass fuer den Reifendruck darstellt. Die(Resonance frequency) represents a measure of the tire pressure. The
Spule 4a befindet sich im oberen erwaehnten Abstand zurCoil 4a is in the upper mentioned distance from
Koppelspule 3, was als die elektromagnetische Kopplung k symbolisiert ist. Der Sensor A wird ueber die Kopplung k von derCoupling coil 3, which is symbolized as the electromagnetic coupling k. The sensor A is connected via the coupling k
Koppelspule 3 zu einer gedaempften Schwingung angeregt. DieCoupling coil 3 excited to a damped vibration. The
Energie kommt vom Pulserzeuger la ueber die Weiche 2 auf dieEnergy comes from the pulse generator via switch 2 to the
Koppelspule. Die gedaempfte Schwingung des angregten Sensors wird ueber die Weiche 2 auf den Verstaerker 5 gegeben. Die Frequenz der Schwingung wird mit dem Frequenzmesser 6 gemesen und mit einem geeigneten Anzeigegeraet 7 zur Anzeige gebracht. DieCoupling coil. The damped oscillation of the excited sensor is transferred to the amplifier 5 via the switch 2. The frequency of the vibration is measured with the frequency meter 6 and displayed with a suitable display device 7. The
Anzeige ist proportional zum Reifendruck.The display is proportional to the tire pressure.
In Fig. 3 ist die elektrische Anordnung nach Patentanspruch 7 dargestellt.In Fig. 3 the electrical arrangement according to claim 7 is shown.
Der Sensor A wird wie vorstehend beschrieben ueber dieSensor A is operated as described above
Kopplung k mit der Koppelspule verbunden. Eine frequenzvariabier Schwingungsserzeuger lb erzeugt eine Frequenz, die in der Naehe der erwarteten Arbeitsfrequenz des Sensors A liegt. Die Frequenz und die Amplitude des Schwingungserzeuger lb werden im Verstaerker 5 verstaerkt und im Frequenzmesser 6 ausgewertet. Vom FrequenzmesserCoupling k connected to the coupling coil. A frequency variable Vibration generator 1b generates a frequency that is close to the expected operating frequency of sensor A. The frequency and the amplitude of the vibration generator 1b are amplified in the amplifier 5 and evaluated in the frequency meter 6. From the frequency meter
6 wird der Schwingungserzeuger lb so lange automatisch nachgeregelt, bis die Frequenz des Schwingungserzeugers 6 dann der des Sensors A entspricht. Der Schwingungserzeuger 6 und der6, the vibration generator 1b is automatically readjusted until the frequency of the vibration generator 6 then corresponds to that of the sensor A. The vibrator 6 and the
Sensor A sind dann in Resonanz, wenn der Leistungsentzug durch denSensor A is in resonance when the power is withdrawn by the
Sensor am groessten ist. Die Charakteristik dieser Regelung ist in Fig. 3a dargestellt. Die Resonanzfrequenz wird von derSensor is largest. The characteristic of this regulation is shown in Fig. 3a. The resonance frequency is determined by the
Anzeige 7 angezeigt. Die Anzeige ist proportional zum Reifendruck.Display 7 is displayed. The display is proportional to the tire pressure.
In Fig. A ist die elektrische Anordnung nach Patentanspruch 8 dargestellt.In Fig. A the electrical arrangement according to claim 8 is shown.
Das Fahrzeugrad enthaelt neben dem Sensor A noch einen aktivenIn addition to sensor A, the vehicle wheel also contains an active one
Schwingungserzeuger 8 mit einer geeigneten Hilfsenergiequelle 9.Vibration generator 8 with a suitable auxiliary energy source 9.
Die Information wird ueber die Kopplung k auf die Koppelspule 3 uebertragen, vom Verstaerker 5 verstaerkt, mit dem FrequenzmesserThe information is transmitted via the coupling k to the coupling coil 3, amplified by the amplifier 5, with the frequency meter
6 ausgewertet und mit dem Anzeigegeraet 7 angezeigt.6 evaluated and displayed with the display device 7.
Fig. 5 entspricht funktionell Fig. A mit dem Zusatz, dass dieFig. 5 corresponds functionally to Fig. A with the addition that the
Hilfsenergiequelle 9 durch eine weitere KoppeIvorrichtung 10, 11 mit der Kopplung k2 ersetzt ist und vom Fahrzeug aus geepeist ist. Die Kopplungen kl und k2 koennen bei geeigneterAuxiliary energy source 9 is replaced by a further coupling device 10, 11 with the coupling k2 and is fed from the vehicle. The couplings kl and k2 can be used with a suitable one
Ausfuehrung in einer einzigen zusammengefasst werden.Execution can be summarized in one.
Die Information ueber den Reifendruck kann ausser zur Anzeige auch zur Alarmgabe bei zu niedrigem oder zu hohem Druck und zurThe information about the tire pressure can be used not only for display purposes, but also for alarms when the pressure is too low or too high and for
Regelung derselben benutzt werden. Regulation of the same can be used.

Claims

PATENTANSPRUECHE PATENT CLAIMS
1. Verfahren zur beruehrungslosen Messung des Drucks in Fahrzeug-Reifen, dadurch gekennzeichnet, dass der Druck kontinuierlich sowohl im Stillstand wie auch waehrend der Fahrt des Fahrzuges gemessen werden kann. Die grundsaetzliche Ausfuehrung besteht aus einem oder mehreren druckempfindlichen im oder am Rad angebrachten Sensoren mit einer beruehrungslosen elektromagnetischen Kopplung zu einer fest am Fahrzeug angebrachten Koppeleinrichtung zur Uebertragung der Druckinformation. Der Sensor besteht in seiner einfachsten Ausfuehrung aus einem elektrischen Schwingkreis, dessen Arbeitsfrequenz sich mittels Betaetigung ueber eine druckempfindliche Membran proportional zum Reifendruck einstellt.1. Method for the contactless measurement of the pressure in vehicle tires, characterized in that the pressure can be measured continuously both when the vehicle is at a standstill and while it is traveling. The basic design consists of one or more pressure-sensitive sensors mounted in or on the wheel with a non-contact electromagnetic coupling to a coupling device fixed to the vehicle for transmitting the pressure information. In its simplest version, the sensor consists of an electrical resonant circuit, the working frequency of which is adjusted in proportion to the tire pressure by means of actuation via a pressure-sensitive membrane.
2. Verfahren nach Anspruch 1 dadurch gekennzeichnet, dass die druckempfindliche Membran-Anordnung zur Messung des Absαlutdruckes oder des relativen Drucks gegenueber dem Aussendruck der Reifen ausgebildet sein kann.2. The method according to claim 1, characterized in that the pressure-sensitive membrane arrangement for measuring the Absαlutdruckes or the relative pressure can be formed compared to the external pressure of the tires.
3. Verfahren nach Anspruch 1 und 2 dadurch gekennzeichnet, dass sich die Arbeitsfrequenz des Schwingkreises durch Verstellen der Kreiskapazitaet, der Kreisinduktivitaet oder beider Schwingkreisteile erreichen laesst, wobei der druckempfindliche Schwingkreisteil selbst die Membrane sein kann.3. The method according to claim 1 and 2, characterized in that the working frequency of the resonant circuit can be achieved by adjusting the circular capacitance, the circular inductance or both oscillating circuit parts, wherein the pressure-sensitive oscillating circuit part itself can be the membrane.
A. Verfahren nach Anspruechen 1 bis 3 dadurch gekennzeichnet, dass der Sensor ueber die beruehrungslose elektromagnetische Kopplung von einem am Fahrzeug angebrachten geeigneten Schwingungserzeuger und einer Koppelspule auf der Arbeitsfrequenz mittels Zufuehrung von elektrischer Energie zum Schwingen angeregt wird. Ueber die gleiche oder eine aehnliche Kopplung wird die elektrische Schwingung auf einen empfindlichen Verstaerker gegeben und soweit verstaerkt, dass man die Arbeitsfrequenz mittels bekannter Frequenzmesseinrichtung messen und zur Anzeige und Auswertung bringen kann.A. Method according to claims 1 to 3, characterized in that the sensor is excited to vibrate via the contactless electromagnetic coupling of a suitable vibration generator attached to the vehicle and a coupling coil on the working frequency by supplying electrical energy. Using the same or a similar coupling, the electrical vibration is sensitive to a Given amplifiers and amplified to the extent that the working frequency can be measured using a known frequency measuring device and displayed and evaluated.
5. Verfahren nach Anspruechen 1 bis 4 dadurch gekennzeichnet, dass man die Energiezufuhr fuer den Sensorschwingkreis mittels eines kurzen Impulses erreichen kann.5. The method according to claims 1 to 4, characterized in that the energy supply for the sensor resonant circuit can be achieved by means of a short pulse.
6. Verfahren nach Anspruechen 1 bis 5 dadurch gekennzeichnet, dass man fuer genaue Messungen, besonders eine groessere Anzahl von Messzyklen, wie bei Anspruechen 4 und 5 beschrieben, durchfuehrt.6. The method according to claims 1 to 5, characterized in that one carries out for precise measurements, especially a larger number of measurement cycles, as described in claims 4 and 5.
7. Verfahren nach Anspruechen 1 bis 4 dadurch gekennzeichnet, dass man die Energiezufuhr mittels einer laenger anhaltenden oder dauernden periodischen Schwingung erreichen kann, wobei man den Schwingungserzeuger in seiner Frequenz auf die Arbeitsfrequenz des Sensors einstellt (dies ist daran zu erkennen, dass bei Uebereinstimmung ein Maximum von Energie vom Sensor entzogen wird). Es genuegt jetzt, nur die Frequenz des Schwingungserzeugers zu messen. Mittels einer geeigneten Regelung kann die Abstimmung automatisch erfolgen.7. The method according to claims 1 to 4, characterized in that the energy supply can be achieved by means of a longer or continuous periodic oscillation, the frequency of the oscillation generator being set to the working frequency of the sensor (this can be recognized from the fact that there is a match) Maximum of energy drawn from the sensor). It is now sufficient to measure only the frequency of the vibration generator. Appropriate regulation enables the vote to take place automatically.
8. Verfahren nach Anspruechen 1 bis 3 dadurch gekennzelehnet, dass der Sensor einen aktive Schwingungserzeuger (Oscillator) enthaelt. Die Information wird ueber eine elektromagnetische Kopplung mittels einer am Fahrzeug angebrachten Koppelspule ueber eine gewisse Distanz beruehrungslos verstaerkt, ausgewertet und angezeigt. Die Hilfsenergie fuer den Schwingungserzeuger wird vorteilhaft ebenfalls beruehrungslos ueber eine elektromagnetische Kopplung uebertragen.8. The method according to claims 1 to 3, characterized in that the sensor contains an active vibration generator (oscillator). The information is contactlessly amplified, evaluated and displayed over a certain distance via an electromagnetic coupling by means of a coupling coil attached to the vehicle. The auxiliary energy for the vibration generator is advantageously also transmitted in a contactless manner via an electromagnetic coupling.
9. Verfahren nach Anspruechen 1 bis 8 dadurch gekennzeichnet, dass die Koppeleinrichtung zur Infαrmations- und Energieuebertragung zwischen Fahrzeug und Rad jeweils aus mindestens 2 elektromagnetisch gekoppelten Spulen bestehen. Es sind folgende Anwendungen moeglich: eine oder mehrere Spulen der Radsensoren und eine oder mehrere, fest am Fahrzeug angebrachte ringfoermige Koppelspulen; eine ödere mehrere ringfoermig angebrachte Spulen der Radsensoren, bzw. Spulen zur Energieuebertragung und eine ödere mehrere fest am Fahrzeug angebrachte ringfoermige Koppelspulen; eine αdere mehrere ringfoermig angebrachte Spulen der Radsensoren, bzw. Spulen zur Energieuebertragung und eine oder mehrere fest am Fahrzeug angebrachte nicht ringfoermige Koppelspulen (normaler kompakter Spulenaufbau).9. The method according to claims 1 to 8, characterized in that the coupling device for information and Energy transmission between vehicle and wheel each consist of at least 2 electromagnetically coupled coils. The following applications are possible: one or more coils of the wheel sensors and one or more ring-shaped coupling coils permanently attached to the vehicle; one or more ring-shaped coils of the wheel sensors or coils for energy transmission and one or more ring-shaped coupling coils fixed to the vehicle; one other several ring-shaped coils of the wheel sensors or coils for energy transmission and one or more non-ring-shaped coupling coils fixed to the vehicle (normal compact coil construction).
10. Verfahren nach Anspruechen 1 bis 8 dadurch gekennzeichnet, dass die Information ueber den Druck im Fahrzeugreifen nicht nur zur Anzeige gebracht wird, sondern dass diese auch dazu dienen kann, geeignete Warnvorrichtungen bei zu niedrigem oder zu hohem Druck betaetigen und/oder zu Regelung des Drucks verwendet werden kann. 10. The method according to claims 1 to 8, characterized in that the information about the pressure in the vehicle tire is not only displayed, but that it can also serve to activate suitable warning devices when the pressure is too low or too high and / or to regulate the pressure Pressure can be used.
EP19860906756 1985-12-13 1986-12-08 Process and method for contact-free measurement of the pressure of vehicle tyres Withdrawn EP0250469A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH530685 1985-12-13
CH5306/85 1985-12-13

Publications (1)

Publication Number Publication Date
EP0250469A1 true EP0250469A1 (en) 1988-01-07

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ID=4291381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860906756 Withdrawn EP0250469A1 (en) 1985-12-13 1986-12-08 Process and method for contact-free measurement of the pressure of vehicle tyres

Country Status (3)

Country Link
EP (1) EP0250469A1 (en)
AU (1) AU6629886A (en)
WO (1) WO1987003544A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1150849B1 (en) * 1999-02-11 2003-05-07 Emtop Limited Signal transmission apparatus and method, sensing apparatus and tyre pressure measuring apparatus including such signal transmission apparatus
WO2012020663A1 (en) * 2010-08-09 2012-02-16 株式会社ブリヂストン Tire internal pressure measuring system

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Publication number Priority date Publication date Assignee Title
US2274557A (en) * 1940-07-10 1942-02-24 Morgan Raymond Electric gauge
US4334428A (en) * 1978-05-04 1982-06-15 Fima Raoul G Apparatus for indicating parameters sensed on a rotatable wheel
DE2951139A1 (en) * 1979-12-19 1981-07-02 Robert Bosch Gmbh, 7000 Stuttgart DEVICE FOR CONTINUOUSLY MONITORING THE AIR PRESSURE IN VEHICLE TIRES
FR2485192A1 (en) * 1980-06-19 1981-12-24 Telecommunications Sa METHOD AND DEVICE FOR MEASURING PRESSURE OF TIRES, IN PARTICULAR FOR AIRCRAFT
DE3029563C2 (en) * 1980-08-05 1990-11-15 Bayerische Motoren Werke AG, 8000 München Transmission method for a variable measured value for the tire pressure of vehicle wheels
EP0108176A1 (en) * 1982-11-05 1984-05-16 Philip Elliot Galasko Detection of a low pressure condition of a pneumatic vehicle tyre

Non-Patent Citations (1)

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Title
See references of WO8703544A1 *

Also Published As

Publication number Publication date
WO1987003544A1 (en) 1987-06-18
AU6629886A (en) 1987-06-30

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